A typical data acquisition system consists of a host computer, operating system program, data acquisition hardware, field wiring and control devices and transducers.
The main objective of data acquisition is to digitize an analog signal without any loss of information and without introducing invalid information.
The sampling theorem states that it is important to sample a signal with a maximum frequency component of f Hz and a minimum sampling frequency of 2F Hz.
An A/D board consists of the input multiplexer, input signal amplifiers, sample and hold circuit, analog to digital converter, bus interface and thus timing system.
There are two methods of connecting signal sources to the data acquisition board which are:
1. Single Ended
2. Differential
Factors to consider when selecting a data acquisition board are:
1. Board Throughput
2. Analog Inputs
3. Number of Channels
4. On Board Features For A/D Section
5. Analog Outputs
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